<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
			body{
				/* background-image: url(img/wyx.jpg); */
				/* background-repeat: no-repeat; */
				/* 背景随着页面滚动：scroll,默认值
				   页面滚动而背景固定：fixed
				 */
				/* background-attachment: fixed;
				background-position: center; */
				/* 复合写法
				   background：color image repeat attachment position/size*/
				background: gainsboro url(img/wyx.jpg) no-repeat fixed center/100% 100%;
			}
			.box {
				width: 1200px;
				height: 1800px;
				border: 1px solid chartreuse;
				/* transparent:透明色 */
				background-color: rgba(255, 135, 25, .4);
				/* background-image: url(img/wyx.jpg); */
				/* 背景图片重复显示：repeat 
				背景图片不重复显示：no-repeat
				*/
				background-repeat: no-repeat;
				font-size: 36px;
			}
		</style>
	</head>
	<body>
		<div class="box">
			这是盒子的内容
		</div>
	</body>
</html>